import java.util.SplittableRandom;
import java.util.Stack;

class MinStack {
    Stack<Integer> stack;
    Stack<Integer> minStack ;

    public MinStack() {
        stack = new Stack();
        minStack = new Stack();
    }
    
    public void push(int val) {
        stack.push(val);
        if(minStack.isEmpty()){
            minStack.push(val);
        }else{
            if(val <= minStack.peek()){
                minStack.push(val);
            }
        }


    }
    
    public void pop() {
        int oldVal = stack.pop();
        if(oldVal == minStack.peek()){
            minStack.pop();
        }

    }
    
    public int top() {
        return stack.peek();

    }
    
    public int getMin() {
        return minStack.peek();
    }
}